Telemetry: do display tracing in rendering.mobile

Bug: 903204
Change-Id: I7d2cbff9184eb9f0fa93bfe14708ca719f145e7a
Reviewed-on: https://chromium-review.googlesource.com/c/1327150Reviewed-by: Ned Nguyen <nednguyen@google.com>
Commit-Queue: Ehsan Chiniforooshan <chiniforooshan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606580}

tools/perf/benchmarks/rendering.py

@@ -61,5 +61,6 @@ class RenderingMobile(perf_benchmark.PerfBenchmark):
   def CreateCoreTimelineBasedMeasurementOptions(self):
     category_filter = chrome_trace_category_filter.CreateLowOverheadFilter()
     options = timeline_based_measurement.Options(category_filter)
+    options.config.enable_platform_display_trace = True
     options.SetTimelineBasedMetrics(['renderingMetric'])
     return options